Home/CVE/Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticate
CVE

CVE-2025-66398

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticate

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticated attacker can pollute the internal state (restoreFilePath) of the server via the /skServer/validateBackup endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., security.json, package.json), leading to account takeover and Remote Code Execution (RCE).

Version 2.19.0 patches this vulnerability.

CRITICAL · CVSS 9.6 EPSS 0.00139
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-913Improper Control of Dynamically-Managed Code Resources
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Affected Products & Versions

1
signalk signal k server< 2.19.0
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Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm signalk-server CRITICAL fixed in 2.19.0
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-w3x5-7c4c-66p9github.com
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Scoring & Timeline

9.6
CRITICAL · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Jan 2026 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/SignalK/signalk-server/releases/tag/v2.19.0Release Notes
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